honestly break down some LED screw in bulbs, Their $2 or less each, plus whatever for heatsinks, but for a PC case you would only need 4-6 of the 8w ones
as comparison the Bridgelux vero 19's are a very nice and cost efficient cob that ive used in an under driven fashion for efficiency in my pc cases, but when you factor in the cost of around $10 a cob for 4 of them, plus two meanwell ballast at $10-15 each plus heatsinks your looking in the $80-100+ range, vs the screw ins which are $8-10 for a 4 pack, plus $5 per heatsink so $30 maybe total.
Honestly i should of went that route to begin with vs the amount of money and time ive spent on various upgrades and changes ive done.
Here's a link on how to break down the 8 w Philips bulbs